/Engine/Source/Runtime/Slate/Public/Framework/MultiBox/MultiBox.h
Called when Slate wants to visualize tooltip. If nobody handles this event, Slate will use default tooltip visualization. If you override this event, you should probably return true.
true if this widget visualized the tooltip content; i.e., the event is handled.
virtual bool OnVisualizeTooltip ( const [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [SWidget](API\Runtime\SlateCore\Widgets\SWidget) > & TooltipContent )